CVE-2024-40998 — ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()

In the following concurrency we will access the uninitialized rs->lock:

ext4_fill_super ext4_register_sysfs // sysfs registered msg_ratelimit_interval_ms // Other processes modify rs->interval to // non-zero via msg_ratelimit_interval_ms ext4_orphan_cleanup ext4_msg(sb, KERN_INFO, "Errors on filesystem, " __ext4_msg ___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state) if (!rs->interval) // do nothing if interval is 0 return 1; raw_spin_trylock_irqsave(&rs->lock, flags) raw_spin_trylock(lock) _raw_spin_trylock __raw_spin_trylock spin_acquire(&lock->dep_map, 0, 1, _RET_IP_) lock_acquire __lock_acquire register_lock_class assign_lock_key dump_stack(); ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); raw_spin_lock_init(&rs->lock); // init rs->lock here

and get the following dump_stack:

========================================================= INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness va…

Most recent entries from all

CVE-2024-40998 — ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()